Open your pip boy
There is no problem with entering Junktown at night unless you are in faction. Certain shopkeerpers? Like those in Junktown? Playing at night/day? You are gonna wait for a night/day to play 10 minutes just so your favorite time of the day will change again? Yeah, you are right. I don't consider myself a "roleplayer" and my aspirations for this game are way too small to focus on it even while not playing it.
Could the train station people give out holodisks on the train stations or have a computer in which we could download the schedule to our pipboys?
buy holodisk, wrote the hours to holo (you can find it here on the forum) and download it to pip-boy